#define _CRT_SECURE_NO_WARNINGS 1
//#include<stdio.h>
//
//int main()
//{
//	double pi = 3.1415926;
//	printf("%f", pi);
//	return 0;
//}
#include<stdio.h>
int main()
{
	float r = 0;
	double pi = 3.1415926;
	scanf("%f", &r);
	double V = r * r*r * 4 / 3 * pi;
	printf("%.3f", V);
	return 0;
}
#include <stdio.h>
int Max(int n1, int n2, int n3, int n4)
{
	if (n1 >= n2 && n1 >= n3 && n1 >= n4)
		return n1;
	else if (n2 >= n1 && n2 >= n3 && n2 >= n4)
		return n2;
	else if (n3 >= n1 && n3 >= n2 && n3 >= n4)
		return n3;
	else
		return n4;

}
int main()
{
	int a = 0, b = 0, c = 0, d = 0;
	scanf("%d %d %d %d", &a, &b, &c, &d);
	int k = Max(a, b, c, d);
	printf("%d", k);
	return 0;
}
#include<stdio.h>
int main()
{
	float r = 0;
	double pi = 3.1415926;
	scanf("%f", &r);
	double V = r * r*r * 4 / 3 * pi;
	printf("%.3f", V);
	return 0;
}
#include<stdio.h>
int main()
{
	float weight = 0;
	float height = 0;
	scanf("%f %f", &weight, &height);
	float Bim = weight / (height / 100) / (height / 100);
	printf("%.2f", Bim);
	return 0;
}